矿床地质2018，Vol.37Issue(3)：643-655,13.DOI:10.16111/j.0258-7106.2018.03.012
西藏申扎县雄梅铜矿床的硫、铅同位素特征及其成矿意义
S, Pb isotopic characteristics of Xiongmei porphyry copper deposit in Tibet and their metallogenic significance
摘要
Abstract
The Xiongmei porphyry copper deposit is located in the middle part of the Bangong Co-Nujiang metallogenic belt in Xiongmei Township,Xainza County,Tibet.Copper mineralization in the mining area is composed of orebearing granodiorite porphyry,malachitization secondary quartzite and ore-bearing hornfels sandy slate.The purpose of this study is to determine the source of ore-forming materials in this area by investigating the regional sulfur and lead isotopes.δ34S values of the sulfide range from-2.5‰ to 6.1‰ with tower distribution,indicative of a magmatic source.The 206Pb/204Pb,207Pb/204Pb and 208Pb/204Pb ratios of Xiongmei ore-bearing sulfide range from 18.220 to 19.005,15.626 to 15.770 and 38.510 to 39.856,respectively,which fall in or near the upper crustal area on the Pb isotope source discrimination diagram.Theμ values of lead are form 9.51 to 9.78,indicating a crustal source.Based on a comparative study of previous work in the Duolong mining area,the authors hold that both the Duolong mining area and the Xiongmei copper deposit were formed under an extension environment of closure/post-collision of the Bangong Co-Nujiang Meso-Tethys Ocean,indicative of a good ore prospecting potential in the Xiongmei area.关键词
地球化学/S-Pb同位素/雄梅斑岩铜矿床/班公湖-怒江成矿带/西藏Key words
geochemistry/S-Pb isotopes/Xiongmei porphyry copper deposit/Bangong Co-Nujiang suture zone/Tibet分类
天文与地球科学引用本文复制引用
黎心远,陈伟,曲晓明,马旭东..西藏申扎县雄梅铜矿床的硫、铅同位素特征及其成矿意义[J].矿床地质,2018,37(3):643-655,13.基金项目
本文得到西藏申扎县雄梅1∶5万矿产地质调查项目(编号:N1604-7)资助 （编号:N1604-7）
